[Bug 229775] syslog(3) includes process id in each message even if LOG_PID is not specified as 2nd argument of openlog(3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229775

--- Comment #3 from Yasuhiro KIMURA <yasu at utahime.org> ---
(In reply to Yuri Pankov from comment #2)

Behavior on 12-CURRENT doesn't conform to POSIX standard and breaks
compatibility with other UNIX-like OSes. And it results in change of
application behavior not intended by author. One example is security/sudo.
According to man page of sudoers(5) there is following configuration option.

----------------------------------------------------------------------
syslog_pid        When logging via syslog(3), include the process ID in
                  the log entry.  This flag is off by default.
----------------------------------------------------------------------

On 11.2-RELEASE it works as is expected. But on 12-CURRENT it doesn't because
process ID is included regardless of this option. And from the viewpoint of
user it looks like bug of sudo. So it is possible someone reports it to author
of sudo. Then he will investigate and find behavior of syslog(3) changed on
12-CURRENT. And to make matters worse he will also find there is no way to
implement it correctly. So it is quite possible he blames syslog(3) of
12-CURRENT is broken.

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